Migrate Cluster
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The following semi-automated process can be used to migrate from MemSQL Ops to SingleStore Tools.
Command output examples are provided.
Note
Unless explicitly stated otherwise, perform all of the following steps on/from the Master Aggregator.
In the commands provided, replace all instances of content in angle brackets with the referenced substitute.
In some cases, a script may require non-password access to all hosts in the cluster.
Review Current Cluster
Use MemSQL Ops to validate the SingleStoreDB cluster health.
memsql-ops memsql-list
ID Agent Id Process State Cluster State Role Host Port Version
44CDE71 A0c8a89 RUNNING CONNECTED MASTER 10.0.0.98 3306 x.x
3FD3FCF Aa5eab9 RUNNING CONNECTED AGGREGATOR 10.0.0.133 3306 x.x
9C0841F A04f65f RUNNING CONNECTED LEAF 10.0.0.236 3306 x.x
9A551DA A5f0572 RUNNING CONNECTED LEAF 10.0.0.136 3306 x.x
Confirm Connectivity
Confirm that memsql-ops agent-ssh
can be used to SSH (open a secure shell) into each host in the cluster.
Note: After invoking the following interactive prompt, exit the command immediately by using Control-C without actually connecting to the hosts via SSH.
sudo memsql-ops agent-ssh
Index ID Host Port Role State Version Has Credential
1 Aeea1ec 10.0.0.98 9000 PRIMARY ONLINE x.x No
2 A005a87 10.0.0.133 9000 FOLLOWER ONLINE x.x Yes
3 Aa9367f 10.0.0.236 9000 FOLLOWER ONLINE x.x Yes
4 Ad90aba 10.0.0.136 9000 FOLLOWER ONLINE x.x Yes
In the output displayed above, only the main host where the Ops primary agent runs should reflectNo
for Has Credential
.
To configure ssh
keys for each host, run the memsql-ops agent-set-credential
command (see instructions).
Alternatively, use the following script to automate this process.ssh
keys where applicable.
memsql-ops agent-list -q | xargs -n 1 memsql-ops agent-set-credential -i </key-file/including/path>
Enable Manual Control
Enable manual control of the SingleStoreDB cluster to prevent MemSQL Ops from interfering with the SingleStoreDB Toolbox install.
memsql-ops cluster-manual-control --enable
The cluster is now under manual control. We will not automatically restart stopped nodes, update license files, etc.
Caution
MemSQL Ops will not automatically restart nodes that fail during the migration unless manual control of the cluster is enabled.
Add a License
If you are currently using the Odin license, which uses an earlier format, update it to the Freya license with the latest format obtained from the Cloud Portal.
memsql-ops license-list -j
The license marked as best
is the one in current use, and the expected format of the license is <HASH>==
.
memsql-ops license-add --license-key <license>
Successfully added license.
Generate Cluster Migration File
Run the following command to generate a cluster migration YAML file that will pass the cluster information from MemSQL Ops to SingleStoreDB Toolbox.
sudo memsql-ops migration-setup
Check succeeded: All nodes on MemSQL version x.x
Check succeeded: All nodes online and connected
Check succeeded: All nodes with supported license version
All checks passed. Migration configuration file written to /var/lib/memsql-ops/data/cache/migration_config.yml
Deploy Migration File
Use the cluster migration YAML generated by the previous command.
sdb-deploy setup-cluster --cluster-file <cluster_file>
View Deploy Cluster Migration File Output
✓ Connection successful to 10.0.0.136✓ Connection successful to 10.0.0.133✓ Connection successful to 10.0.0.236sdb-deploy will perform the following actions:· Register Hosts- Host: 10.0.0.98+ Localhost: true- Host: 10.0.0.136+ Localhost: false+ Port: 22+ Username: <user>- Host: 10.0.0.133+ Localhost: false+ Port: 22+ Username: <user>- Host: 10.0.0.236+ Localhost: false+ Port: 22+ Username: <user>· Install MemSQL Server- Install singlestoredb-server x.x on 10.0.0.98- Install singlestoredb-server x.x on 10.0.0.136- Install singlestoredb-server x.x on 10.0.0.133- Install singlestoredb-server x.x on 10.0.0.236· Register Node- On Host: 10.0.0.136+ Run 'memsqlctl register-node --memsql-config /var/lib/memsql/leaf-3306-MI2fc1915e/memsql.cnf --datadir /var/lib/memsql/leaf-3306-MI2fc1915e/data --plancachedir /var/lib/memsql/leaf-3306-MI2fc1915e/plancache --tracelogsdir /var/lib/memsql/leaf-3306-MI2fc1915e/tracelogs --port 3306'- On Host: 10.0.0.133+ Run 'memsqlctl register-node --memsql-config /var/lib/memsql/child-3306-MIb4668da6/memsql.cnf --datadir /var/lib/memsql/child-3306-MIb4668da6/data --plancachedir /var/lib/memsql/child-3306-MIb4668da6/plancache --tracelogsdir /var/lib/memsql/child-3306-MIb4668da6/tracelogs --port 3306'- On Host: 10.0.0.236+ Run 'memsqlctl register-node --memsql-config /var/lib/memsql/leaf-3306-MId88e2bc0/memsql.cnf --datadir /var/lib/memsql/leaf-3306-MId88e2bc0/data --plancachedir /var/lib/memsql/leaf-3306-MId88e2bc0/plancache --tracelogsdir /var/lib/memsql/leaf-3306-MId88e2bc0/tracelogs --port 3306'- On Host: 10.0.0.98+ Run 'memsqlctl register-node --memsql-config /var/lib/memsql/master-3306-MI436853b1/memsql.cnf --datadir /var/lib/memsql/master-3306-MI436853b1/data --plancachedir /var/lib/memsql/master-3306-MI436853b1/plancache --tracelogsdir /var/lib/memsql/master-3306-MI436853b1/tracelogs --port 3306'· After executing the above actions the cluster is going to be in the following state:- 4 Registered nodesWould you like to continue? [y/N]: y✓ Registered hosts✓ Installed singlestoredb-server<version> on host 10.0.0.236 (1/4)✓ Installed singlestoredb-server<version> on host 10.0.0.98 (2/4)✓ Installed singlestoredb-server<version> on host 10.0.0.136 (3/4)✓ Installed singlestoredb-server<version> on host 10.0.0.133 (4/4)✓ Successfully installed on 4 hosts✓ Successfully registered nodes✓ No Nodes to Create✓ No Leaves to add✓ No Aggregators to addThe Final Cluster StateHosts+----------------+------------+---------------------------+---------------+| Host | Local Host | SSH address | Identity File |+----------------+------------+---------------------------+---------------+| 10.0.0.98 | Yes | | || 10.0.0.133 | No | <user>@10.0.0.133:22 | || 10.0.0.136 | No | <user>@10.0.0.136:22 | || 10.0.0.236 | No | <user>@10.0.0.236:22 | |+----------------+------------+---------------------------+---------------+Nodes+------------+------------+----------------+------+---------------+--------------+---------+----------------+--------------------+--------------+| MemSQL ID | Role | Host | Port | Process State | Connectable? | Version | Recovery State | Availability Group | Bind Address |+------------+------------+----------------+------+---------------+--------------+---------+----------------+--------------------+--------------+| 6C1E8E88A6 | Master | 10.0.0.98 | 3306 | Running | True | x.x | Online | | 0.0.0.0 || BE9E87CCE3 | Aggregator | 10.0.0.133 | 3306 | Running | True | x.x | Online | | 0.0.0.0 || 8419072D05 | Leaf | 10.0.0.136 | 3306 | Running | True | x.x | Online | 2 | 0.0.0.0 || 36B777507F | Leaf | 10.0.0.236 | 3306 | Running | True | x.x | Online | 1 | 0.0.0.0 |+------------+------------+----------------+------+---------------+--------------+---------+----------------+--------------------+--------------+
Confirm Registered Hosts
Use SingleStoreDB Toolbox to confirm that all hosts have been registered.
sdb-toolbox-config list-hosts
+------------+------------+-------------+--------------------------+
| Host | Local Host | SSH address | Identity File |
+------------+------------+-------------+--------------------------+
| 10.0.0.98 | No | 10.0.0.98 | /home/<user>/.ssh/id_rsa |
| 10.0.0.133 | No | 10.0.0.133 | /home/<user>/.ssh/id_rsa |
| 10.0.0.136 | No | 10.0.0.136 | /home/<user>/.ssh/id_rsa |
| 10.0.0.236 | No | 10.0.0.236 | /home/<user>/.ssh/id_rsa |
+------------+------------+-------------+--------------------------+
Confirm Registered Nodes
Use SingleStoreDB Toolbox to confirm that all nodes have been registered.
sdb-admin list-nodes
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
| MemSQL ID | Role | Host | Port | Process State | Connectable? | Version | Recovery State | Availability Group |
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
| 0EAE75B920 | Master | 10.0.0.98 | 3306 | Running | True | x.x | Online | |
| 35B6AA0317 | Aggregator | 10.0.0.133 | 3306 | Running | True | x.x | Online | |
| B964A18F18 | Leaf | 10.0.0.136 | 3306 | Running | True | x.x | Online | 1 |
| 1A8EDD42BB | Leaf | 10.0.0.236 | 3306 | Running | True | x.x | Online | 2 |
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
Restart Nodes
Use SingleStoreDB Toolbox to restart all nodes.
sdb-admin restart-node --all
For high-availability clusters, you may include the --online
option to perform a rolling restart of the cluster, which allows the workload to continue while the nodes are restarted.
sdb-admin restart-node --all --online
Warning
While this step is underway, the node state may be registered incorrectly in SingleStoreDB Toolbox (as displayed by sdb-admin list-nodes
).SHOW LEAVES
or SHOW AGGREGATORS
executed in a database connection to the Master Aggregator.
View Restart Nodes Output
Toolbox is about to perform the following actions:· Restart all nodes in the clusterWould you like to continue? [y/N]: y✓ Stopped Master node on 10.0.0.98 (1/1)✓ Successfully stopped Master node on 1 host✓ Stopped Master node✓ Stopped Aggregator nodes on 10.0.0.133 (1/1)✓ Successfully stopped Aggregator nodes on 1 host✓ Stopped Aggregator node✓ Stopped Leaf nodes on 10.0.0.136 (1/2)✓ Stopped Leaf nodes on 10.0.0.236 (2/2)✓ Successfully stopped Leaf nodes on 2 hosts✓ Stopped Leaf nodes✓ Started Leaf nodes on 10.0.0.236 (1/2)✓ Started Leaf nodes on 10.0.0.136 (2/2)✓ Successfully started Leaf nodes on 2 hosts✓ Successfully connected to Leaf nodes✓ Started Aggregator nodes on 10.0.0.133 (1/1)✓ Successfully started Aggregator nodes on 1 host✓ Successfully connected to Aggregator node✓ Started Master node on 10.0.0.98 (1/1)✓ Successfully started Master node on 1 host✓ Successfully connected to Master nodeOperation completed successfully
Confirm Node Restart
Confirm that all nodes have restarted.
sdb-admin list-nodes
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
| MemSQL ID | Role | Host | Port | Process State | Connectable? | Version | Recovery State | Availability Group |
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
| D785AA80D7 | Master | 10.0.0.98 | 3306 | Running | True | x.x | Online | |
| 9098564B01 | Aggregator | 10.0.0.133 | 3306 | Running | True | x.x | Online | |
| 2189856FC2 | Leaf | 10.0.0.136 | 3306 | Running | True | x.x | Online | 2 |
| 3094B68557 | Leaf | 10.0.0.236 | 3306 | Running | True | x.x | Online | 1 |
+------------+------------+------------+------+---------------+--------------+---------+----------------+--------------------+
Unmonitor Nodes
Once SingleStoreDB Toolbox is managing the SingleStoreDB cluster, the competing MemSQL Ops management system must be uninstalled.
Use MemSQL Ops to list all running nodes.
memsql-ops memsql-list
ID Agent Id Process State Cluster State Role Host Port Version
44CDE71 A0c8a89 RUNNING CONNECTED MASTER 10.0.0.98 3306 x.x
3FD3FCF Aa5eab9 RUNNING CONNECTED AGGREGATOR 10.0.0.133 3306 x.x
9C0841F A04f65f RUNNING CONNECTED LEAF 10.0.0.236 3306 x.x
9A551DA A5f0572 RUNNING CONNECTED LEAF 10.0.0.136 3306 x.x
Use MemSQL Ops to stop monitoring each SingleStoreDB node.
Use the IDs from the ID
column in the MemSQL Ops output.
Caution
Do not remove the leaf nodes if prompted.
Main Host
Run the following command on the main host, which is usually the host of the Master Aggregator.
memsql-ops memsql-unmonitor 44CDE71
2019-07-02 16:30:23: J9fe705 [INFO] Stopping monitoring for MemSQL node ABECB9CFBB84C5369982BE10A85EC050D20486B0
2019-07-02 16:30:23: J9fe705 [INFO] No longer monitoring MemSQL node ABECB9CFBB84C5369982BE10A85EC050D20486B0
Unmonitor Remaining Nodes
Child Aggregator
memsql-ops memsql-unmonitor 3FD3FCF
2019-07-02 16:30:54: J6fb0f3 [INFO] Stopping monitoring for MemSQL node 4DF1BC43819C21D33B6D6AAE02C8851F40709FDF
2019-07-02 16:30:54: J6fb0f3 [INFO] No longer monitoring MemSQL node 4DF1BC43819C21D33B6D6AAE02C8851F40709FDF
Leaf Node 1
memsql-ops memsql-unmonitor 9C0841F
Would you additionally like to remove the leaf node from the SingleStoreDB cluster? (You can specify this behavior with --remove-leaf.) [y/n] n
2019-07-02 16:31:22: J2eae2d [INFO] Stopping monitoring for MemSQL node AF1C3A169BFE4FD792163909BDB592C65D0E37AF
2019-07-02 16:31:22: J2eae2d [INFO] No longer monitoring MemSQL node AF1C3A169BFE4FD792163909BDB592C65D0E37AF
Note: If a leaf is removed unintentionally, connect to the database and run ADD LEAF
to add it back to the cluster: For example, on the Master Aggregator: memsql> ADD LEAF 'root'@'<<leaf node IP>>':3307
Leaf Node 2
memsql-ops memsql-unmonitor 9A551DA
Would you additionally like to remove the leaf node from the SingleStoreDB cluster? (You can specify this behavior with --remove-leaf.) [y/n] n
2019-07-02 16:32:01: J52843c [INFO] Stopping monitoring for MemSQL node 143B60B39072A9E9C16D2D8ACC16E6997286079E
2019-07-02 16:32:01: J52843c [INFO] No longer monitoring MemSQL node 143B60B39072A9E9C16D2D8ACC16E6997286079E
Note: If a leaf is removed unintentionally, connect to the database and run ADD LEAF
to add it back to the cluster: For example, on the Master Aggregator: memsql> ADD LEAF 'root'@'<<leaf node IP>>':3307
Remove MemSQL Ops
sudo memsql-ops agent-uninstall --uninstall-ops-only --all
The --uninstall-ops-only
flag ensures that the MemSQL Ops agent will be uninstalled without deleting any node data.
View Remove MemSQL Ops Output
This will completely delete all MemSQL Ops agents in the cluster, including this one. This operation will delete all MemSQL Ops data in the cluster and cannot be undone.If you want to delete all MemSQL Ops agents, please type the word DELETE: DELETE2019-09-06 13:58:23: J91ad35 [INFO] Deleting MemSQL Ops agent Ae9f037643ccf4b5fb3b0c03f2dd0da582019-09-06 13:58:23: J4cc070 [INFO] Deleting MemSQL Ops agent Ae2838b5fd2164d3a8691ad71227beee32019-09-06 13:58:23: Jfb011f [INFO] Deleting MemSQL Ops agent Afea25a7c3e184241acdf5296f429298d2019-09-06 13:58:27: J4cc070 [INFO] Successfully deleted MemSQL Ops agent Ae2838b5fd2164d3a8691ad71227beee32019-09-06 13:58:27: Jfb011f [INFO] Successfully deleted MemSQL Ops agent Afea25a7c3e184241acdf5296f429298d2019-09-06 13:58:27: J91ad35 [INFO] Successfully deleted MemSQL Ops agent Ae9f037643ccf4b5fb3b0c03f2dd0da58WARNING: An unmonitored MemSQL node may still exist on this machine. It had host 172.16.212.165 and port 3306 the last time MemSQL Ops connected to it.Stopping MemSQL OpsWaiting up to 60 seconds for a clean exit.Done.Successfully uninstalled MemSQL Ops
Last modified: April 3, 2023